least squares — a method of estimating values from a set of observations by minimizing the sum of the squares of the differences between the observations and the values to be found.
there's — in or at that place (opposed to here): She is there now.
upstairs — up the stairs; to or on an upper floor.
where's — in or at what place?: Where is he? Where do you live?
Three-syllable rhymes
charge d'affaires — A chargé d'affaires is a person appointed to act as head of a diplomatic mission in a foreign country while the ambassador is away.
kick upstairs — to strike with the foot or feet: to kick the ball; to kick someone in the shins.
put on airs — a mixture of nitrogen, oxygen, and minute amounts of other gases that surrounds the earth and forms its atmosphere.
unawares — while not aware or conscious of a thing oneself; unknowingly or inadvertently.